Home › Tools › Engineering › Cover Bolt Stress
ShivOlive™A ShivOlive™ engineering tool · hosted by RetailDA™

Cover Bolt Stress

Tensile stress across the casing-cover bolts from internal pressure — the quick check before you sign off a rating.

No sign-upRuns offline in your browserFormula shown
bar
mm²
Area inside the bolt-circle / gasket mean diameter.
—
in
UN thread series — diameter in inches.
tpi

Result

Fill in the fields — the result appears as you type.

Method & assumptions
F = P(MPa)·A ÷ bolts deff = D − 0.9743 ÷ n σ = Fbolt ÷ (0.7854·deff² in mm²)

End load from pressure over the enclosed area, spread across the bolts, applied to the approximate tensile-stress area of a UN thread. Compare the result with the bolt material's proof stress — keep a healthy margin.

Engineering aid only — verify results against the applicable code edition and the equipment datasheet before committing to a design.

Enquire Runs live in Ultra Z — Pump & Motor Batch →

Like the free tools? Imagine all 55 on one ledger.

Start a guided trial with no card required, model your site count in the live calculator — plans from ₹999/site/mo — or book a walkthrough with an engineer.

Start free trialPrice your sites →Book a demo